Microstructural evolution and mechanical properties of TLP bonded joints of Mar-M247 superalloys with Ni-Cr-Co-W-Ta-B interlayer

Mingcan, Liu; Sheng, Guangmin; Hongjie, He; Jiao, Yingjun

doi:10.1016/j.jmatprotec.2017.03.021

Cited by 52 publications

(14 citation statements)

References 23 publications

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“…[2] for the liquid phase (Filler alloy B), and Eq. [3] for the second solid phase (Base Metal C). Equation [4] is the velocity term that describes the movement of the first solid-liquid interface (Interface 1) and Eq.…”

Section: A Governing Equationsmentioning

confidence: 99%

“…TRANSIENT liquid phase (TLP) diffusion bonding was developed to avoid cracking problems encountered during the welding of difficult-to-weld advanced materials, such as nickel based superalloys that are used in aircraft gas turbine engines. [1][2][3][4] There are four main stages in the TLP bonding process: heating, base-metal dissolution, isothermal solidification, and homogenization. [5,6] When the TLP sample is heated to the joining temperature, a liquid layer forms between two adjoining solids.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation Study of Temperature Gradient Transient Liquid Phase Bonding with Concentration-Dependent Diffusivity

Bamidele

Ojo

2021

Metall Mater Trans A

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A new numerical model is developed to study the kinetics of temperature gradient transient liquid phase (TG-TLP) bonding under concentration-dependent diffusivity by using a first-order implicit-explicit finite-difference numerical method and Landau coordinate transformation with adaptable spatial discretization. The model is validated with experimental data reported in the literature. The results of computational analysis by the new model show that the presence of solute concentration gradient in the liquid is the major factor that enables shorter solidification completion time in TG-TLP bonding compared to the conventional transient liquid phase bonding (C-TLP bonding). In contrast to the common assumption that solid-state diffusion can be ignored during the modeling of TG-TLP bonding, this work shows that solid-state diffusion plays a significant role, not only in controlling the transition in solidification behavior from bidirectional to unidirectional, but also affects the kinetics of the bonding process. Moreover, it is found that the anomalous increase in solidification completion time with increase in temperature that occurs during C-TLP bonding can be avoided by TG-TLP bonding. This is possible if the solute concentration gradient in the liquid is sufficiently high to enable adequate solidification kinetics to overcome increased volume of liquid that accompanies increase in bonding temperature.

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Section: A Governing Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Study of Temperature Gradient Transient Liquid Phase Bonding with Concentration-Dependent Diffusivity

Bamidele

Ojo

2021

Metall Mater Trans A

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“…This is consistent with the results of Boucherit et al (2017), who found that Cu atoms were inserted between Zn and Al because the thermal conductivity of Cu was higher than that of Zn, and the melting point of Zn was lower than that of Cu. By increasing the micro hardness of the intermetallic compound, it increased brittleness (Balasundaram et al, 2014;Ustinov et al, 2017;Liu et al, 2017).…”

Section: Micro Hardness Analysismentioning

confidence: 99%

Mechanical Properties of the Micro Resistance Spot Welding of Aluminum Alloy to Stainless Steel with a Zinc Interlayer

Muzakki

Baskoro²,

Kiswanto³

et al. 2018

IJTech

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All metals have unique advantages and disadvantages in terms of their mechanical properties. Advantages such as flexibility are needed for construction and for the manufacture of sophisticated products. Some industries have improved the mechanical properties of metals by welding dissimilar ones together, such as aluminum alloy (AA) to stainless steel (SS) to reduce vehicle weights in order to improve fuel consumption. However, little research has been conducted on using micro resistance spot welding (mRSW) to join SS and Al by inserting a zinc (Zn) sheet between them as an interlayer. In this study, the mechanical properties of the weldment are tested using a shear test and Vickers micro hardness test. The results are compared using welding times of 6, 8 and 10 cycle times (CTs) and welding currents of 5 and 8 kA during the mRSW process. It is found that the SS, Zn and AA sheets could be joined with mRSW using an 8 kAA welding current and a 6 CT welding time. The micro hardness in the AA-Zn dissimilar joint increased relative to SS-Zn. Using a Zn sheet also improved displacement in the tensile shear test; however, it also increased the hardness of the diffusion zone.

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“…Amorphous Ni-based brazing alloys are extensively used in the brazing of cobalt- [ 10 ], nickel- [ 11 ], and iron -based [ 12 ] alloys. Also, examinations of the diffusion brazing of cobalt- [ 13 ], nickel- [ 14 ], and iron-based [ 15 ] alloys revealed that these processes are likely to achieve a bond strength near the strength of base metals. Cobalt-based superalloys are extensively applied in the power plant and gas turbine manufacture industries.…”

Section: Introductionmentioning

confidence: 99%

Phase Formation during Heating of Amorphous Nickel-Based BNi-3 for Joining of Dissimilar Cobalt-Based Superalloys

et al. 2021

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Phase transformations and the melting range of the interlayer BNi-3 were investigated by differential scanning calorimetry, which showed three stages of crystallization during heating. There were three exothermic peaks that indicated crystallization in the solid state. The cobalt-based X-45 and FSX-414 superalloys were bonded with interlayer BNi-3 at a constant holding time of 10 min with bonding temperatures of 1010, 1050, 1100, and 1150 °C using a vacuum diffusion brazing process. Examination of microstructural changes in the base metals with light microscopy and scanning electron microscopy coupled with X-ray spectroscopy based on the energy distribution showed that increasing temperature caused a solidification mode, such that the bonding centerline at 1010 °C/10 min included a γ-solid solution, Ni3B, Ni6Si2B, and Ni3Si. The athermally solidified zone of the transient liquid phase (TLP)-bonded sample at 1050 °C/10 min involved a γ-solid solution, Ni3B, CrB, Ni6Si2B, and Ni3Si. Finally, isothermal solidification was completed within 10 min at 1150 °C. The diffusion-affected zones on both sides had three distinct zones: a coarse block precipitation zone, a fine and needle-like mixed-precipitation zone, and a needle-like precipitation zone. By increasing the bonding temperature, the diffusion-affected zone became wider and led to dissolution.

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Microstructural evolution and mechanical properties of TLP bonded joints of Mar-M247 superalloys with Ni-Cr-Co-W-Ta-B interlayer

Cited by 52 publications

References 23 publications

Numerical Simulation Study of Temperature Gradient Transient Liquid Phase Bonding with Concentration-Dependent Diffusivity

Numerical Simulation Study of Temperature Gradient Transient Liquid Phase Bonding with Concentration-Dependent Diffusivity

Mechanical Properties of the Micro Resistance Spot Welding of Aluminum Alloy to Stainless Steel with a Zinc Interlayer

Phase Formation during Heating of Amorphous Nickel-Based BNi-3 for Joining of Dissimilar Cobalt-Based Superalloys

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